For our furnace and air duct cleaning service, the air is compressed at 250 PSI. The Negative Air Pressure creates a powerful pull to suck out all the dust and debris. Our technicians will start the cleaning process with the air duct vents furthest away from the furnace and gradually work their way towards the furnace. As dust and debris is pulled from the air duct vents by the negative air pressure, other tools are used to push and agitate the dirt and grime simultaneously. The dirt will be forced into the main trunk line of the Duct System. It is then sucked into the large powerful vacuum which is attached to the furnace by the Cleaning Technicians at the beginning of the furnace and air duct cleaning process and subsequently removed from the home.